October 2011 - Physics

Test Preparation SAT Subject Test Preparation
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<p>Okay, I don't want to scare people away from discussing now - USA is done :)</p>

<p>Copied from the old thread</p>

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<p>What did you put for the ruler attached to the clamp? Was it simple harmonic motion?</p>

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<p>I put simple harmonic motion. I don't remember the other options but I remember excluding some because the acceleration of the end would not be constant.</p>

<p>Yeah, I think that one was that the frequency of the light must be greater than the sound wave because we know speed=wavelength x frequency, and we know that the speed of light is greater than that of sound and their wavelengths are equal so the light's frequency must be larger.</p>

<p>I wasn't sure on the switch one. I was just talking to one of my friends and he knew the capacitor questions and I think he'd know that one, too. I'll ask him next time I get a chance.</p>

<p>I really wasn't sure on the standing wave, either. All I could eliminate was the one that was flat because that could be a standing wave of n=2 or something (I'm terrible with fundamental frequencies). I think I narrowed it down to b and d or something because I knew it couldn't be one of them but I ended up omitting it.
The answer to the "which of the following does this demonstrate" was ohm's law, I'm pretty sure. I brought it down to ampere and ohm, but i put ohm.
I remember putting down something for the hot to cold one, I think it was the entropy choice.
I don't really remember the accelerating block question, more details and I may remember.
The one with the block stopping, the second one was 18N I'm quite sure. I answered the first one, too, but I don't remember the question or what I put. I'd be happy to explain why I put 18N if you'd like.
I don't remember that one.
Oh, I remember the .05, that was the one asking what happens to the force when you half the distance or something, I think I put 1/4F, which was A, maybe.
I don't know what you're asking on that one. Do you remember something about a particle (it was definitely an electron) going into an electric field and it asked what the direction of the magnetic field must be for the particle to remain with a constant velocity (ie no net force), I thought about it for a while and then I put down, which was opposite the electric field.
I remember two masses connected by a rope and the top mass was connected to the ceiling, I think I put the combined m*g and something else, that was an easy one, though. I'm not sure what you're asking for the 3-1 tensions, maybe that was it.
Alpha particle was definitely D, yeah, I remember putting C and then checking it over and being all "wow, I'm a dumbass". Mass goes down 4, atomic number goes down 2.
I'm quite sure I put that as well, the 75 60 60 thing, because watts are joules per second...oh wait, I think I had them all multiplied, you have them divided by 2000, I don't remember the question, just multiplying by 3600 to get to hours, but where did the 2000 come from? I don't remember?
I don't remember that problem, I may have ran out of time (I'm talking about the speaker one).
Vector additions? It was the only one that went up and to the left (the slope would be high negative), you could figure that by do head to head addition of the vectors.
Do you remember the question about the computer graphing that guys' velocity? I put the one that didn't cross the x axis put was positive for all of x.</p>

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<p>Getting more scared as some of these answers come out. I’m hoping on the huge curve to save me, I don’t want to retake this test again but if I get lower than a 700 I kind of have to.</p>

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<p>by the way,
im not sure on this stuff</p>

<p>4 m/s^2 for acceleration of the block being pulled
mu is 1/6 (what were the other two answers for the accelerating to a stop along 2m friction?)</p>

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<p>If anyone wants to know what I put for a q, tell me the full q or as much as you can remember and i’ll see what I can remember :)</p>

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<p>I think I got 1/25 for the mu.
I don’t know about the acceleration question, I don’t remember it.</p>

<p>Edit: Ughhhh.
It wasn’t 1/25. I just realized I forgot to calculate the vertical force for my calculations of normal force.
Friiiiiiiiiiiick. Missing a Kinematics question is rare for me (everything else is where I basically get hit hard), but I barely had any time so I rushed through that.</p>

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<p>Can you remind me what the q was?
Was it the one where they showed the vertical and horizontal forces acting?</p>

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<p>I hope the curve of this test can be generous T^T I left 10 questions… And I’m struggling of whether retaking it if I only get 780 or 790…</p>

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<p>"Do you remember the question about the computer graphing that guys’ velocity? I put the one that didn’t cross the x axis put was positive for all of x.</p>

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<p>Yeah, sorry, I wasn’t specific enough, I mean “a positive slope for all of x”, but, the velocity was negative for the entire domain (i.e. didn’t cross the x axis).</p>

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<p>I disagree with the part about the sound box moving away from the detector. The answer should be frequency should be lower, due to the doppler effect
If the wavelengths for light and sound are the same, the light’s frequency is much greater than the sound wave’s frequency
The one that’s not a standing wave is the one that looks like a sine wave, i think.
Vector addition was the one that had four arrows in it and the added direction pointed to the northwest.
Heat goes from hot to cold due the entropy is always increasing</p>

<p>Coupla questions I have
was the metal strip in the diagram (followup to Ohm’s Law graph) have the resistor symbol?
And the electron moving through an electric and magnetic field: I believe the field has to point out because: the electron is moving south (remember electron moves in opposite direction of field lines) and therefore to continue in a straight path field force points north.
According to the right hand rule, magnetic force on electron is the BACK of your palm, and therefore the field will point out of the page.</p>

<p>And can someone tell me how to do that 3N and 2N on the ceiling question? I put just 3N and 2N for the ropes.</p>

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<p>I was absolutely destroyed by this test. So many conceptual type questions… Praying for a 700+.</p>

<p>I put 5N and 2N for the tension in the ropes one, but I was far from certain.</p>

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<p>The Computer Graphing question is just simple… he just walks faster to the computer… thus it should be either more positive or more negative without changing direction (passing through the axis)… I just have question on the capacitor question… I think the light after switched will be dimmer and dimmer…</p>

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<p>BTW I put 50N 20N too</p>

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<p>^ it’s 5N and 2N sor</p>

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<p>This test was definitely next level, the test changed so much from the practice test in the official book</p>

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<p>Not sure exactly what you mean, but I do think it was a lot harder than the test in the PR book. Albeit, I only did half of one test out of the book, but I still found that the SAT II was much more conceptually based; that’s not a good thing for me.</p>

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<p>yay let’s prey for a -16 raws 800 -_-… lol</p>

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<p>^The sad thing is that still wouldn’t be enough for me to get an 800…</p>

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<p>So Who knows the exact question of the capacitor one… I remember the question but forget the choices…</p>

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<p>I think there were two questions to the capacitor thing. I think they went something like this if I remember correctly.</p>

<ol>
<li>When the switch is closed, the bulb is brightly lit. What happens to the bulb after the switch is closed for a long time? </li>
</ol>

<p>I put that the bulb slowly dims (because the capacitor gains voltage)</p>

<ol>
<li>If the switch is suddenly moved to the other position, (connected capacitor to bulb), what happens to the lightbulb? </li>
</ol>

<p>I put that the bulb is brightly lit at first but then dims later, as the capacitor runs out of voltage.</p>

<p>How do you represent a metal strip in a circuit diagram?</p>

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<p>^
as a resistor…</p>

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<p>I also put that the light bulb slowly dims, but not because of that (I can’t remember exactly why did I choose that)</p>